Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
84.0
80
68
92
90
88
February
94.5
98
88
100
94
100
March
96.0
100
87
97
98
100
April
98.4
99
99
100
100
May
99.2
100
99
99
99
June
99.6
100
98
100
100
July
99.5
100
99
97
100
August
95.2
100
99
87
85
September
95.4
100
98
100
70
October
95.4
88
100
95
88
November
86.0
95
84
78
98
December
83.3
89
77
66
91
Average
93.6
89.7
92.4
96.0
92.0
93.3
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
14.2
14
14
16
15
14
February
16.6
16
14
20
18
20
March
18.6
15
15
23
19
19
April
24.0
23
24
27
25
May
28.7
22
29
31
30
June
33.6
31
35
35
34
July
37.2
38
37
39
37
August
35.9
36
37
36
37
September
32.3
30
33
34
34
October
26.9
27
28
24
30
November
18.3
20
17
18
19
December
14.0
16
12
12
15
Average
23.8
15.1
24.0
26.4
24.9
26.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
6.1
8
6
4
6
6
February
5.8
8
4
5
7
6
March
7.7
9
7
9
6
8
April
10.3
9
10
10
12
May
13.6
17
13
14
15
June
17.8
17
18
19
18
July
19.8
21
19
20
19
August
19.4
20
19
19
21
September
16.6
16
18
16
18
October
11.4
12
13
12
13
November
7.3
8
5
9
6
December
4.9
7
4
6
5
Average
11.2
8.0
11.5
11.7
11.5
12.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.0
12
19
1
4
4
February
7.6
12
11
0
2
0
March
9.3
15
23
1
3
6
April
4.4
1
5
1
1
May
2.5
0
2
0
1
June
0.5
0
2
0
0
July
0.0
0
0
0
0
August
0.2
2
0
0
0
September
0.5
1
2
0
0
October
1.4
3
0
6
0
November
5.2
4
6
3
3
December
8.1
9
16
9
3
Average
5.0
12.3
6.3
2.3
2.2
1.4
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
6.2
6
8
5
5
6
February
7.0
8
8
5
6
5
March
7.2
9
9
6
7
8
April
6.4
7
8
5
5
May
6.6
5
8
6
7
June
6.0
6
7
6
6
July
4.4
5
5
5
4
August
4.0
5
4
4
4
September
4.9
5
5
5
4
October
5.0
5
3
7
5
November
4.8
5
6
4
5
December
4.9
5
6
7
5
Average
5.8
7.2
6.0
5.7
5.6
5.2
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
155°
158°
230°
165°
163°
February
164°
169°
294°
255°
303°
March
156°
161°
200°
180°
161°
April
195°
180°
174°
213°
May
173°
241°
243°
180°
June
174°
187°
169°
202°
July
178°
172°
175°
183°
August
207°
181°
196°
193°
September
177°
192°
202°
237°
October
244°
257°
168°
294°
November
221°
171°
239°
196°
December
160°
169°
162°
214°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.